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A database of 18S rRNA metabarcodes

Database version: 1.1 - 41 datasets

Shiny application version: 1.0.3


MetaPR2 is a database of published 18S rRNA metabarcodes that have been reprocessed and assigned using PR2.

Acessing the database

Access to the database to map, search and download the barcodes can be done in three different ways:

  • Using a web interface.

  • Download the R package and launch the shiny application.

1 - Web interface

2 - metaPR2 shiny R package

  • Install the package from GitHub and launch function metapr2App()


Note: You may have to install some packages required by metapr2 if they are not installed on your machine


Extensive help is provided here.


Please report errors in the Issues page of the metaPR2 database.


Vaulot, D., Sim, C.W.H., Ong, D., Teo, B., Biwer, C., Jamy, M., Lopes dos Santos, A., 2022. metaPR2: a database of eukaryotic 18S rRNA metabarcodes with an emphasis on protists. BioRxiv.



  • Daniel Vaulot, CNRS Roscoff, NTU-ASE Geek lab
  • Adriana Lopes dos Santos, NTU-ASE Geek lab
  • Clarence Sim, NTU-ASE Geek lab
  • Denise Ong, NTU-ASE Geek lab
  • Bryan Teo, NTU-ASE Geek lab
  • Charlie Biwer, Uppsala University Sweden
  • Mahwash Jamy, Uppsala University Sweden